/* Grade Calculator Tool Styles */

/* Tool Container - Full Page Layout */
.grade-calculator-tool {
    width: 100%;
    min-height: 100vh;
    background: linear-gradient(135deg, #f8fafc 0%, #ffffff 100%);
    padding: 0;
    margin: 0;
}

.tool-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
}

/* Tool Header */
.tool-header {
    text-align: center;
    margin-bottom: 1.5rem;
    padding: 1rem 0;
}

.tool-header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: rgb(34, 33, 33);
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.tool-header h1 i {
    color: var(--primary-color);
    font-size: 1.8rem;
}

.tool-description {
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: 0;
    line-height: 1.6;
}

/* Calculator Card */
.calculator-card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

/* Categories Section */
.categories-section {
    margin-bottom: 2rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid #e5e7eb;
}

.section-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-color);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-header h3 i {
    color: var(--primary-color);
}

.add-category-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.add-category-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

/* Category Item */
.category-item {
    background: #f9fafb;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    transition: all 0.2s ease;
}

.category-item:hover {
    border-color: var(--primary-color);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.category-name {
    font-weight: 600;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.category-name i {
    color: var(--primary-color);
}

.remove-category-btn {
    background: #ef4444;
    color: white;
    border: none;
    border-radius: 6px;
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.remove-category-btn:hover {
    background: #dc2626;
}

.category-inputs {
    display: grid;
    grid-template-columns: 2fr 1fr 2fr;
    gap: 1rem;
    align-items: end;
}

.input-group {
    display: flex;
    flex-direction: column;
}

.input-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.category-name-input,
.category-weight-input,
.category-grade-input {
    padding: 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 0.875rem;
    transition: all 0.2s ease;
}

.category-name-input:focus,
.category-weight-input:focus,
.category-grade-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Weight Summary */
.weight-summary {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: #f3f4f6;
    border-radius: 8px;
    margin-top: 1rem;
}

.weight-text {
    font-weight: 600;
    color: var(--text-color);
}

.weight-status {
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
}

.weight-status.valid {
    background: #dcfce7;
    color: #166534;
}

.weight-status.invalid {
    background: #fef2f2;
    color: #dc2626;
}

/* Target Section */
.target-section {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: #f8fafc;
    border-radius: 8px;
    border: 1px solid #e5e7eb;
}

.target-section h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.target-section h3 i {
    color: var(--primary-color);
}

.target-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.target-select,
.custom-target-input {
    padding: 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 0.875rem;
    background: white;
    transition: all 0.2s ease;
}

.target-select:focus,
.custom-target-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Action Controls */
.action-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 1rem;
}

.calculate-btn,
.clear-btn {
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    position: relative;
}

.calculate-btn {
    background: linear-gradient(135deg, var(--primary-color) 0%, #1d4ed8 100%);
    color: white;
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
}

.calculate-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.clear-btn {
    background: #f3f4f6;
    color: var(--text-color);
}

.clear-btn:hover {
    background: #e5e7eb;
    transform: translateY(-1px);
}

/* Loading Spinner */
.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Results Section */
.results-section {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid #e5e7eb;
}

.results-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-color);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.results-header h3 i {
    color: var(--primary-color);
}

.copy-result-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.copy-result-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

/* Results Grid */
.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.result-card {
    background: linear-gradient(135deg, #f8fafc 0%, #ffffff 100%);
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.2s ease;
}

.result-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.result-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

.result-icon i {
    color: white;
    font-size: 1.25rem;
}

.result-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.result-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 0.25rem;
}

.result-letter {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-color);
}

/* Breakdown Section */
.breakdown-section {
    margin-bottom: 2rem;
}

.breakdown-section h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.breakdown-section h4 i {
    color: var(--primary-color);
}

.breakdown-table {
    background: #f9fafb;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid #e5e7eb;
}

.breakdown-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid #e5e7eb;
    align-items: center;
}

.breakdown-row:last-child {
    border-bottom: none;
}

.breakdown-row.header {
    background: #f3f4f6;
    font-weight: 600;
    color: var(--text-color);
}

.breakdown-row:not(.header):hover {
    background: #f0f9ff;
}

.breakdown-category {
    font-weight: 500;
    color: var(--text-color);
}

.breakdown-weight,
.breakdown-grade,
.breakdown-contribution {
    text-align: center;
    font-size: 0.875rem;
}

.breakdown-contribution {
    font-weight: 600;
    color: var(--primary-color);
}

/* Grade Scale Section */
.grade-scale-section {
    margin-bottom: 2rem;
}

.grade-scale-section h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.grade-scale-section h4 i {
    color: var(--primary-color);
}

.grade-scale-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.5rem;
}

.scale-item {
    background: #f9fafb;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    padding: 0.75rem;
    text-align: center;
    transition: all 0.2s ease;
}

.scale-item:hover {
    background: #f0f9ff;
    border-color: var(--primary-color);
}

.scale-letter {
    display: block;
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.scale-range {
    display: block;
    font-size: 0.75rem;
    color: var(--text-light);
    margin-bottom: 0.25rem;
}

.scale-gpa {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-color);
}

/* Examples Section */
.examples-section {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

.examples-section h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.examples-section h3 i {
    color: var(--primary-color);
}

.examples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

.example-item {
    background: linear-gradient(135deg, #f8fafc 0%, #ffffff 100%);
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.example-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

.example-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

.example-icon i {
    color: white;
    font-size: 1.25rem;
}

.example-label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.example-description {
    font-size: 0.875rem;
    color: var(--text-light);
    line-height: 1.4;
}

/* Related Tools Section */
.related-tools-section {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

.related-tools-header {
    text-align: center;
    margin-bottom: 1.5rem;
}

.related-tools-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-color);
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.related-tools-header h3 i {
    color: var(--primary-color);
}

.related-tools-header p {
    color: var(--text-light);
    margin: 0.5rem 0 0 0;
    font-size: 0.95rem;
}

.related-tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.75rem;
}

.related-tool-link {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    color: var(--primary-color);
    text-decoration: none;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
    transition: all 0.3s ease;
    border: 1px solid #e5e7eb;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.related-tool-link:hover {
    background: linear-gradient(135deg, var(--primary-color) 0%, #2563eb 100%);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.related-tool-link i {
    font-size: 0.875rem;
}

/* Mobile Responsive Styles */
@media (max-width: 768px) {
    .tool-container {
        padding: 1rem;
    }

    .tool-header h1 {
        font-size: 1.75rem;
        flex-direction: column;
        gap: 0.5rem;
    }

    .calculator-card,
    .results-section,
    .examples-section {
        padding: 1.5rem;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .category-inputs {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .target-controls {
        grid-template-columns: 1fr;
    }

    .action-controls {
        flex-direction: column;
        gap: 0.75rem;
    }

    .calculate-btn,
    .clear-btn {
        width: 100%;
        justify-content: center;
    }

    .results-grid {
        grid-template-columns: 1fr;
    }

    .breakdown-row {
        grid-template-columns: 1fr;
        gap: 0.5rem;
        text-align: left;
    }

    .breakdown-row.header {
        display: none;
    }

    .breakdown-row:not(.header) {
        background: white;
        border: 1px solid #e5e7eb;
        border-radius: 6px;
        margin-bottom: 0.5rem;
        padding: 1rem;
    }

    .breakdown-category::before {
        content: "Category: ";
        font-weight: 600;
        color: var(--text-light);
    }

    .breakdown-weight::before {
        content: "Weight: ";
        font-weight: 600;
        color: var(--text-light);
    }

    .breakdown-grade::before {
        content: "Grade: ";
        font-weight: 600;
        color: var(--text-light);
    }

    .breakdown-contribution::before {
        content: "Contribution: ";
        font-weight: 600;
        color: var(--text-light);
    }

    .grade-scale-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .examples-grid {
        grid-template-columns: 1fr;
    }

    .related-tools-section {
        padding: 1.5rem;
    }

    .related-tools-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }

    .related-tool-link {
        padding: 0.625rem 0.75rem;
        font-size: 0.8rem;
        flex-direction: column;
        gap: 4px;
    }

    .related-tool-link i {
        font-size: 1.1rem;
    }
}

@media (max-width: 480px) {
    .tool-container {
        padding: 0.75rem;
    }

    .tool-header h1 {
        font-size: 1.5rem;
    }

    .calculator-card,
    .results-section,
    .examples-section {
        padding: 1rem;
    }

    .result-value {
        font-size: 1.75rem;
    }

    .grade-scale-grid {
        grid-template-columns: 1fr;
    }

    .scale-item {
        padding: 0.5rem;
    }

    .related-tools-section {
        padding: 1rem;
    }

    .related-tools-grid {
        grid-template-columns: 1fr;
    }

    .related-tool-link {
        flex-direction: row;
        gap: 8px;
        justify-content: flex-start;
        text-align: left;
    }
}

/* High DPI Display Support */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .spinner {
        border-width: 3px;
    }
}